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    <title>Document</title>
    <style>
      div {
        background: linear-gradient(180deg, #238be8 0%, #f0f0f0 100%),
          linear-gradient(180deg, #aed6ff 0%, rgba(210, 224, 255, 0) 100%);
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      .box1 {
        width: 100px;
        height: 400px;
      }
      .box2 {
        width: 100px;
        height: 700px;
      }
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  <body>
    <!-- 

      关于渐变色的一些问题处理
     -->
    <div class="box1"></div>
    <div class="box2"></div>
  </body>
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